A chemical called contrast may be used to help improve the pictures. Some people can have an allergic reaction or develop
kidney problems
with contrast material.
However, these reactions are rare. Your doctor will review a list of possible complications of a CT scan with contrast.

A CT scan does use radiation. You and your doctor will weigh the harms and benefits of this test. A CT scan may not be advised if you are pregnant.

Prior to Test

Avoid eating or drinking anything for 4 hours before the test if contrast will be used.

Remove any metal objects, such as jewelry, hearing aids, or dentures.

Description of the Test

If contrast is needed, it will be injected into a vein.

You will be positioned on a special moving table. The table will move slowly through the CT scanner. You will need to stay still during the entire test. The technician may need to use a device to keep your head still. As the scanner takes pictures, you will hear humming and clicking. You will be able to talk to the technician through an intercom.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

To send comments or feedback to our Editorial Team regarding the content please email us at healthlibrarysupport@ebscohost.com. Our Health Library Support team will respond to your email request within 2 business days.